Dust suppressant forming a resilient layer

Details Dust suppressant forming a resilient layer Dust suppressant forming a resilient layer

C - Chemistry, Metallurgy

09

K

6/160, 400/1600,

C09K 3/22 (2006.01)

Patent

CA 1312977

ABSTRACT OF DISCLOSURE A DUST SUPPRESSANT FORMING A RESILIENT LAYER A dust suppressant forming a resilient layer penet- rating dusting materials. This suppressant comprises at least 45% water. A water thickening agent is dissolved in water, and forms with water the dispersion medium. A coal tar pitch is dissolved in an aromatic solvent and forms the dispersed liquid which results in suspension. The aromatic solvent has generally a residual softening point of about 40-70°C (as measured by ASTM-D-36), and forms the dispersed liquid which results in the suspension. This dust suppressant has a viscosity of 3500 to 15000 cps at 25°C. A process for making same comprises: 1- adding to water having a pH of about 7 to 9, a thickening agent to form a dispersion medium having a viscosity of at least 2000 centipoises at 25°C as measured with ASTM-D4420, with a Brookfield, 2- dispensing under high shear conditions into said dispersion medium, a pitch dissolved in an aromatic solvent, at least 70% of which is boiling over 270°C, said aromatic solvent being substantially the solvent agent of said pitch and preferably consisting of anthracene oil, to obtain a suspension (in concentrate form) having at least 45% water content. A process is also contemplated which includes diluting a suspension in concentrate form to obtain a diluted suspension having 90-98% water content by weight, and 2-10% by weight of said suspension in concentrate form, and directly spraying said diluted suspension at the rate 10-40 grams of solids per metric ton of dusting material.

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